Hi all / Takashi,  I saw Takashi has a patch for this question: https://www.mail-archive.com/alsa-user@xxxxxxxxxxxxxxxxxxxxx/msg25548.html But I still have this issue when I use â??hooksâ?? and â??dmixâ?? plugin in my asound.conf. I am using alsa-lib and utils 1.1.9. Aplay â??v xxx.wav from one console and aplay â??v yyy.wav from another console. Can Takashi or any other one help? Thanks!   My asound.conf is:  pcm.dmix_44 {        type dmix        slave.pcm "spk_stereo"        ipc_key 321456 # any unique value        ipc_key_add_uid true        slave {                pcm "hw:0"                format S32_LE                rate 44100        } }  pcm.spk_stereo {                  type hw                            card "MapleLeaf"                   device 0                           format S32_LE }  pcm.playback {                type hooks                slave.pcm "dmix_44"                hooks.0 {                           type ctl_elems                           hook_args [                              {                                name "HPL Output Mixer L_DAC Switch"                                preserve true                                lock true                                value true                              }                              {                                name "HPR Output Mixer R_DAC Switch"                                preserve true                                lock true                                value true                              }                              {                                name "HP DAC Playback Switch"                                preserve true                                lock true                                value [ 1 1 ]                              }                              {                                name "HP Driver Gain Volume"                                preserve true                                lock true                                value [ 6 6 ] #[6 6]=0dB, [3 3]=-3dB                              }                              {                                name "REF Power-up Cfg"                                preserve true                                lock true                                value 1 #40ms                              }                           ]                 }  }  pcm.hooks {  type asym  playback.pcm "playback"  capture.pcm "capture"  }  pcm.!default {  type plug  slave.pcm "hooks" }   First aplay play out music. Second failed as: # aplay LRMonoPhase4.wav Playing WAVE 'LRMonoPhase4.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo ALSA lib setup.c:96:(snd_sctl_install) Cannot lock ctl elem aplay: set_params:1403: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 48000 PERIOD_TIME: (23129 23130) PERIOD_SIZE: [1110 1110] PERIOD_BYTES: (4440 4444) PERIODS: (2 3) BUFFER_TIME: 69375 BUFFER_SIZE: 3330 BUFFER_BYTES: 13320 TICK_TIME: 0  1st aplay shows: # aplay -v Hotel_California.wav Playing WAVE 'Hotel_California.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Plug PCM: Linear conversion PCM (S32_LE) Its setup is:  stream      : PLAYBACK  access      : RW_INTERLEAVED  format      : S16_LE  subformat   : STD  channels    : 2  rate        : 44100  exact rate  : 44100 (44100/1)  msbits      : 16  buffer_size : 3060  period_size : 1020  period_time  : 23129  tstamp_mode : NONE  tstamp_type : MONOTONIC  period_step : 1  avail_min   : 1020  period_event : 0  start_threshold : 3060  stop_threshold  : 3060  silence_threshold: 0  silence_size : 0  boundary    : 1604321280 Slave: Hooks PCM Its setup is:  stream      : PLAYBACK  access      : MMAP_INTERLEAVED  format      : S32_LE  subformat   : STD  channels    : 2  rate        : 44100  exact rate  : 44100 (44100/1)  msbits      : 32  buffer_size : 3060  period_size : 1020  period_time : 23129  tstamp_mode : NONE  tstamp_type : MONOTONIC  period_step : 1  avail_min   : 1020  period_event : 0  start_threshold : 3060  stop_threshold  : 3060  silence_threshold: 0  silence_size : 0  boundary    : 1604321280 Slave: Direct Stream Mixing PCM Its setup is:  stream      : PLAYBACK  access      : MMAP_INTERLEAVED  format      : S32_LE  subformat   : STD  channels    : 2  rate        : 44100  exact rate  : 44100 (44100/1)  msbits      : 32  buffer_size : 3060  period_size : 1020  period_time : 23129  tstamp_mode : NONE  tstamp_type : MONOTONIC  period_step : 1  avail_min   : 1020  period_event : 0  start_threshold : 3060  stop_threshold  : 3060  silence_threshold: 0  silence_size : 0  boundary    : 1604321280 Hardware PCM card 0 'MapleLeaf' device 0 subdevice 0 Its setup is:  stream      : PLAYBACK  access      : MMAP_INTERLEAVED  format      : S32_LE  subformat   : STD  channels    : 2  rate        : 44100  exact rate  : 44100 (44100/1)  msbits      : 32kasho  buffer_size : 3060  period_size : 1020  period_time : 23129  tstamp_mode : ENABLE  tstamp_type : MONOTONIC  period_step : 1  avail_min   : 1020  period_event : 0  start_threshold : 1  stop_threshold  : 1604321280  silence_threshold: 0  silence_size : 1604321280  boundary    : 1604321280  appl_ptr    : 0  hw_ptr      : 13260   Regards! Kevin    |
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